Hi, I have been observing lately that my car is maintaining LOT of distance from front car in adaptive cruise or drive assist. Please see attached image. Even when I select one bar using gap settings button on steering wheel, distance between front car and mine is too big. It's on straight highways too, no turns. Is this sensor recalibration issue or software issue or working as designed? Can someone please confirm before I bother service center? Thanks
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Distance adjustments using gap settings button
- Thread starter kae02
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Maybe it is because you set the cruise speed @87mph and you are in a 70mph zone.
Hahha... automatic policing.Maybe it is because you set the cruise speed @87mph and you are in a 70mph zone.
folks - pls see if someone can post their experience and advise if it's same/different. Challenge I see is frequently other cars cut through which is very frustrating in heavy traffic, leaving gaps between cars means inviting other cars to cut through- Joined
- Mar 13, 2025
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I think many cars are like this--our last three cars included. In heavy-ish traffic where the passing lane is going 75-80, I find adaptive cruise control leaves a reasonable amount of space, which invites antsy drivers to cut in. Then my car slows to maintain adequate space. Then people behind me get frustrated, pass me on the right, then zip in front of me, and my car slows to create adequate space. So I don't use adaptive cruise control when highways are busy--particularly when jousting with truck traffic.Hahha... automatic policing.
The following distance scales with speed. So yeah, at 82 I'd expect one bar to still be a good bit of room. The Air GT's 60-0 stopping distance has been measured at 115 feet on the summer 21s (best case), so that's not a bad thing for the ACC to assume. I understand you may have to get closer while maneuvering, but that's on you.
I get similar experience in stop and go traffic as well. My car starts as soon as front car begins moving but maintains lot of distance for another car to "easily" cut in and gap settings button set to minimum gap is still not sufficient
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In my opinion the short distance needed to "prevent" other cars from cutting in is too short to allow time to brake in an emergency situation. This is what leads to multiple-car pile-ups.
I drive my X with the longest-possible follow distance. In very heavy traffic I will reduce to maybe 4 or 5 of 7. Any closer is likely too close for safety.
Rules of thumb:
* 1 car length per 10mph. 8 x 20 suggests 160 feet. Average Semi is about 72'. So a little more than 2 truck lengths. The picture looks like a bit less than that.
* 2 second rule: 80mph is 117 ft/sec. 234 feet or 3.25 truck lengths. The picture above is much closer than this.
Have you actually timed how much sooner you would arrive at your destination if you didn't have 20 cars cut in like that? It's minimal.
Please be safe out there. If you want to cut the margins too close for safety, maybe don't criticize the automated systems for being a bit more conservative.
I drive my X with the longest-possible follow distance. In very heavy traffic I will reduce to maybe 4 or 5 of 7. Any closer is likely too close for safety.
Rules of thumb:
* 1 car length per 10mph. 8 x 20 suggests 160 feet. Average Semi is about 72'. So a little more than 2 truck lengths. The picture looks like a bit less than that.
* 2 second rule: 80mph is 117 ft/sec. 234 feet or 3.25 truck lengths. The picture above is much closer than this.
Have you actually timed how much sooner you would arrive at your destination if you didn't have 20 cars cut in like that? It's minimal.
Please be safe out there. If you want to cut the margins too close for safety, maybe don't criticize the automated systems for being a bit more conservative.
Oh my god, take it easy. Please read my original post again. I have a very simple question - just to know is there an issue or working as designed. If working as designed/no issue, chapter closed, lets move on. No one is criticizing anyone here. If other cars show different behavior then I'll reach out to service center. Thats it.
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Out here the police generally give 10 miles above the speed limit before they start ticketing drivers. It is very common to see folks with a setting 12 miles above the speed limit to account for the errors deliberately built into the speedometer. Doing so one is still passed by many, many drivers on the freeways out here.
As others have noted here, everyone drives differently and what is too close for one is too far for another.
